High intensity LED lasts 100,000 hours. Powered by by 3 AAAA batteries. Runs up to 60 continuous hours. Momentary blink and constant "on" modes. Serialized for easy identification The revolutionary Stylus combines the convenience of a penlight with the power of a high-intensity LED. These tough, durable, safety rated, waterproof lights are ideal for a variety of tasks, from reading a map on a camping trip and inspecting hard-to-see places, to forensic investigations and tactical law enforcement operations. Comes with pocket clip for easy access. Length: 6.21"; weight: 1.1 oz.